Variability of time series barbell kinematics in elite male weightlifters

Frontiers in Sports and Active Living

Sports and Active Living

Nico Nitzsche¹  Ingo Sandau²  Georg Langen² 

[1] Department Sports Medicine/Sports Biology, Institute of Human Movement Science, University of Technology Chemnitz, Chemnitz,, Germany;Department Strength, Power, and Technical Sports, Institute for Applied Training Science, Leipzig, Germany;

关键词: snatch;    clean;    jerk;    reliability;    performance;   

DOI  :  10.3389/fspor.2023.1264280

 received in 2023-07-20, accepted in 2023-08-18,  发布年份 2023

来源: Frontiers

【 摘 要 】

IntroductionBarbell kinematics are an essential aspect of assessing weightlifting performance. This study aimed at analyzing the total variability of time series barbell kinematics during repeated lifts in the snatch and the clean and jerk at submaximal and maximal barbell loads.MethodsIn a test-retest design, seven male weightlifters lifted submaximal [85% planned one-repetition maximum (1RMp)] and maximal (97% 1RMp) loads in the snatch and the clean and jerk during training. Barbell trajectory, vertical velocity, and vertical acceleration were determined using video analysis. Standard error of measurement (SEM), intraclass correlation coefficient (ICC), and smallest real difference (SRD) were used to determine the total variability during the lifts. Hedge's g effect size was used to assess differences in SEM between submaximal and maximal loads.ResultsThe main findings indicated that variability—in particular for the barbell velocity—was lower at maximal compared to submaximal barbell loads (g = 0.52–2.93). SEM of time series data showed that variability increased in the snatch and the clean and jerk from the 1st pull/dip to the catch position irrespectively of the barbell load.DiscussionThis study presents values of total variability of time series barbell kinematics during the snatch, the clean, and the jerk. Further, the SRD can be used to evaluate changes in barbell kinematics in response to training. In addition, when interpreting barbell kinematics, coaches should take into account that the variability of barbell kinematics can vary depending on the exercise and the barbell load.

【 授权许可】

Unknown   
© 2023 Sandau, Langen and Nitzsche.